feat: Integrate statime for PTP time sync

Co-authored-by: aider (gemini/gemini-2.5-pro-preview-05-06) <aider@aider.chat>

Cargo.toml

@@ -10,4 +10,9 @@ crossterm   = "0.29"
 regex       = "1.11"
 serde       = { version = "1.0", features = ["derive"] }
 serde_json  = "1.0"
-notify      = "8.1.0"
+notify      = "8.1.0"
+statime = "0.4.0"
+statime-linux = "0.4.0"
+tokio = { version = "1", features = ["full"] }
+log = "0.4"
+env_logger = "0.11"

config.json

@@ -1,3 +1,5 @@
 {
-  "hardware_offset_ms": 20
+  "hardware_offset_ms": 20,
+  "ptp_enabled": true,
+  "ptp_interface": "eth0"
 }

src/config.rs

@@ -12,50 +12,69 @@ use std::{
     sync::{Arc, Mutex},
 };
 
-#[derive(Deserialize)]
+#[derive(Deserialize, Clone, Debug)]
 pub struct Config {
     pub hardware_offset_ms: i64,
+    #[serde(default)]
+    pub ptp_enabled: bool,
+    #[serde(default = "default_ptp_interface")]
+    pub ptp_interface: String,
+}
+
+fn default_ptp_interface() -> String {
+    "eth0".to_string()
+}
+
+impl Default for Config {
+    fn default() -> Self {
+        Self {
+            hardware_offset_ms: 0,
+            ptp_enabled: false,
+            ptp_interface: default_ptp_interface(),
+        }
+    }
 }
 
 impl Config {
     pub fn load(path: &PathBuf) -> Self {
         let mut file = match File::open(path) {
             Ok(f) => f,
-            Err(_) => return Self { hardware_offset_ms: 0 },
+            Err(_) => return Self::default(),
         };
         let mut contents = String::new();
         if file.read_to_string(&mut contents).is_err() {
-            return Self { hardware_offset_ms: 0 };
+            return Self::default();
         }
-        serde_json::from_str(&contents).unwrap_or(Self { hardware_offset_ms: 0 })
+        serde_json::from_str(&contents).unwrap_or_else(|e| {
+            eprintln!("Failed to parse config.json: {}, using default", e);
+            Self::default()
+        })
     }
 }
 
-pub fn watch_config(path: &str) -> Arc<Mutex<i64>> {
+pub fn watch_config(path: &str) -> Arc<Mutex<Config>> {
-    let initial = Config::load(&PathBuf::from(path)).hardware_offset_ms;
+    let initial_config = Config::load(&PathBuf::from(path));
-    let offset = Arc::new(Mutex::new(initial));
+    let config = Arc::new(Mutex::new(initial_config));
 
-    // Owned PathBuf for watch() call
     let watch_path = PathBuf::from(path);
-    // Clone for moving into the closure
     let watch_path_for_cb = watch_path.clone();
-    let offset_for_cb = Arc::clone(&offset);
+    let config_for_cb = Arc::clone(&config);
 
     std::thread::spawn(move || {
-        // Move `watch_path_for_cb` into the callback
+        let event_handler = move |res: NotifyResult<Event>| {
-        let mut watcher: RecommendedWatcher = recommended_watcher(move |res: NotifyResult<Event>| {
             if let Ok(evt) = res {
                 if matches!(evt.kind, EventKind::Modify(_)) {
                     let new_cfg = Config::load(&watch_path_for_cb);
-                    let mut hw = offset_for_cb.lock().unwrap();
+                    eprintln!("🔄 Reloaded config.json: {:?}", new_cfg);
-                    *hw = new_cfg.hardware_offset_ms;
+                    let mut cfg = config_for_cb.lock().unwrap();
-                    eprintln!("🔄 Reloaded hardware_offset_ms = {}", *hw);
+                    *cfg = new_cfg;
                 }
             }
-        })
+        };
-        .expect("Failed to create file watcher");
+
+        let mut watcher: RecommendedWatcher =
+            recommended_watcher(event_handler).expect("Failed to create file watcher");
 
-        // Use the original `watch_path` here
         watcher
             .watch(&watch_path, RecursiveMode::NonRecursive)
             .expect("Failed to watch config.json");
@@ -65,5 +84,5 @@ pub fn watch_config(path: &str) -> Arc<Mutex<i64>> {
         }
     });
 
-    offset
+    config
 }

src/main.rs

@@ -1,19 +1,22 @@
 // src/main.rs
 
+
 mod config;
-mod sync_logic;
+mod ptp;
 mod serial_input;
+mod sync_logic;
 mod ui;
 
 use crate::config::watch_config;
-use crate::sync_logic::LtcState;
+use crate::ptp::start_ptp_client;
 use crate::serial_input::start_serial_thread;
+use crate::sync_logic::LtcState;
 use crate::ui::start_ui;
 
 use std::{
     fs,
     path::Path,
-    sync::{Arc, Mutex, mpsc},
+    sync::{mpsc, Arc, Mutex},
     thread,
 };
 
@@ -30,13 +33,15 @@ fn ensure_config() {
     }
 }
 
-fn main() {
+#[tokio::main]
+async fn main() {
     // 🔄 Ensure there's always a config.json present
     ensure_config();
+    env_logger::init();
 
     // 1️⃣ Start watching config.json for changes
-    let hw_offset = watch_config("config.json");
+    let config_arc = watch_config("config.json");
-    println!("🔧 Watching config.json (hardware_offset_ms)...");
+    println!("🔧 Watching config.json...");
 
     // 2️⃣ Channel for raw LTC frames
     let (tx, rx) = mpsc::channel();
@@ -62,19 +67,29 @@ fn main() {
         });
     }
 
-    // 5️⃣ Spawn the UI renderer thread, passing the live offset Arc
+    // 5️⃣ Spawn PTP client task
     {
-        let ui_state     = ltc_state.clone();
+        let ptp_state = ltc_state.clone();
-        let offset_clone = hw_offset.clone();
+        let config_clone = config_arc.clone();
-        let port         = "/dev/ttyACM0".to_string();
+        tokio::spawn(async move {
-        thread::spawn(move || {
+            println!("🚀 PTP task launched");
-            println!("🖥️ UI thread launched");
+            start_ptp_client(ptp_state, config_clone).await;
-            start_ui(ui_state, port, offset_clone);
         });
     }
 
-    // 6️⃣ Keep main thread alive
+    // 6️⃣ Spawn the UI renderer thread, passing the live config Arc
-    println!("📡 Main thread entering loop...");
+    {
+        let ui_state = ltc_state.clone();
+        let config_clone = config_arc.clone();
+        let port = "/dev/ttyACM0".to_string();
+        thread::spawn(move || {
+            println!("🖥️ UI thread launched");
+            start_ui(ui_state, port, config_clone);
+        });
+    }
+
+    // 7️⃣ Keep main thread alive for LTC frames
+    println!("📡 Main thread entering LTC frame loop...");
     for _frame in rx {
         // no-op
     }

src/ptp.rs

@@ -0,0 +1,88 @@
+
+use crate::config::Config;
+use crate::sync_logic::LtcState;
+use statime::{Config as PtpConfig, PtpInstance};
+use statime_linux::{LinuxClock, LinuxUdpSocket};
+use std::sync::{Arc, Mutex};
+use std::time::Duration;
+use tokio::time::sleep;
+
+pub async fn start_ptp_client(state: Arc<Mutex<LtcState>>, config: Arc<Mutex<Config>>) {
+    loop {
+        let (enabled, interface) = {
+            let cfg = config.lock().unwrap();
+            (cfg.ptp_enabled, cfg.ptp_interface.clone())
+        };
+
+        if !enabled {
+            {
+                let mut st = state.lock().unwrap();
+                if st.ptp_state != "Disabled" {
+                    st.ptp_state = "Disabled".to_string();
+                    st.ptp_offset = None;
+                    log::info!("PTP client disabled via config.");
+                }
+            }
+            sleep(Duration::from_secs(5)).await;
+            continue;
+        }
+
+        log::info!("Starting PTP client on interface {}", interface);
+        {
+            let mut st = state.lock().unwrap();
+            st.ptp_state = format!("Starting on {}", interface);
+        }
+
+        let result = run_ptp_session(state.clone(), config.clone()).await;
+
+        if let Err(e) = result {
+            log::error!("PTP client error: {}", e);
+            let mut st = state.lock().unwrap();
+            st.ptp_state = format!("Error: {}", e);
+            st.ptp_offset = None;
+        }
+
+        // Wait before retrying or checking config again
+        sleep(Duration::from_secs(5)).await;
+    }
+}
+
+async fn run_ptp_session(
+    state: Arc<Mutex<LtcState>>,
+    config: Arc<Mutex<Config>>,
+) -> Result<(), Box<dyn std::error::Error + Send + Sync>> {
+    let interface = config.lock().unwrap().ptp_interface.clone();
+
+    let mut ptp_config = PtpConfig::default();
+    ptp_config.set_iface(interface.clone());
+    ptp_config.set_use_hardware_timestamping(false);
+
+    let clock = LinuxClock::new();
+    let socket = LinuxUdpSocket::new(ptp_config.clone())?;
+    let mut instance = PtpInstance::new(ptp_config, socket, clock);
+
+    let initial_interface = interface;
+
+    loop {
+        let (enabled, current_interface) = {
+            let cfg = config.lock().unwrap();
+            (cfg.ptp_enabled, cfg.ptp_interface.clone())
+        };
+
+        if !enabled || current_interface != initial_interface {
+            log::info!("PTP disabled or interface changed. Stopping PTP session.");
+            return Ok(());
+        }
+
+        if let Err(e) = instance.tick().await {
+            log::warn!("PTP tick error: {}", e);
+        }
+
+        let summary = instance.get_summary();
+        let mut st = state.lock().unwrap();
+        st.ptp_offset = summary.offset;
+        st.ptp_state = summary.state.to_string();
+
+        sleep(Duration::from_millis(200)).await;
+    }
+}

src/sync_logic.rs

@@ -45,6 +45,9 @@ pub struct LtcState {
     pub offset_history: VecDeque<i64>,
     pub last_match_status: String,
     pub last_match_check: i64,
+    // PTP state
+    pub ptp_offset: Option<f64>,
+    pub ptp_state: String,
 }
 
 impl LtcState {
@@ -56,6 +59,8 @@ impl LtcState {
             offset_history: VecDeque::with_capacity(20),
             last_match_status: "UNKNOWN".into(),
             last_match_check: 0,
+            ptp_offset: None,
+            ptp_state: "Initializing".into(),
         }
     }
 

src/ui.rs

@@ -17,21 +17,25 @@ use crossterm::{
     terminal::{self, Clear, ClearType, EnterAlternateScreen, LeaveAlternateScreen},
 };
 
+use crate::config::Config;
 use crate::sync_logic::LtcState;
 
-/// Launch the TUI; reads `offset` live from the file-watcher.
+/// Launch the TUI; reads `config` live from the file-watcher.
 pub fn start_ui(
     state: Arc<Mutex<LtcState>>,
     serial_port: String,
-    offset: Arc<Mutex<i64>>,
+    config: Arc<Mutex<Config>>,
 ) {
     let mut stdout = stdout();
     execute!(stdout, EnterAlternateScreen).unwrap();
     terminal::enable_raw_mode().unwrap();
 
     loop {
-        // 1️⃣ Read current hardware offset
+        // 1️⃣ Read current config
-        let hw_offset_ms = *offset.lock().unwrap();
+        let (hw_offset_ms, ptp_enabled) = {
+            let cfg = config.lock().unwrap();
+            (cfg.hardware_offset_ms, cfg.ptp_enabled)
+        };
 
         // 2️⃣ Measure & record jitter only when LOCKED; clear on FREE
         {
@@ -97,6 +101,28 @@ pub fn start_ui(
             .unwrap();
         }
 
+        // PTP Status Display
+        if ptp_enabled {
+            if let Ok(st) = state.lock() {
+                let (ptp_state_str, ptp_offset_val) =
+                    (st.ptp_state.clone(), st.ptp_offset);
+
+                let offset_display = if let Some(offset) = ptp_offset_val {
+                    format!("{:.3}μs", offset / 1000.0)
+                } else {
+                    "N/A".to_string()
+                };
+
+                queue!(
+                    stdout,
+                    MoveTo(45, 1), Print("PTP Status"),
+                    MoveTo(45, 2), Print(format!("State  : {}", ptp_state_str)),
+                    MoveTo(45, 3), Print(format!("Offset : {}", offset_display)),
+                )
+                .unwrap();
+            }
+        }
+
         // Footer
         queue!(
             stdout,